5611891 has 4 divisors (see below), whose sum is σ = 5617072. Its totient is φ = 5606712.

The previous prime is 5611873. The next prime is 5611913. The reversal of 5611891 is 1981165.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 5611891 - 2⁷ = 5611763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5611831) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 276 + ... + 3361.

It is an arithmetic number, because the mean of its divisors is an integer number (1404268).

Almost surely, 2^5611891 is an apocalyptic number.

5611891 is a deficient number, since it is larger than the sum of its proper divisors (5181).

5611891 is a wasteful number, since it uses less digits than its factorization.

5611891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5180.

The product of its digits is 2160, while the sum is 31.

The square root of 5611891 is about 2368.9430132445. The cubic root of 5611891 is about 177.7064027570.

The spelling of 5611891 in words is "five million, six hundred eleven thousand, eight hundred ninety-one".